toolchain: Fix android build

Let's start tracking these revisions independent of desktop
diff --git a/buildAndroid/spirv-tools_revision_android b/buildAndroid/spirv-tools_revision_android
new file mode 100644
index 0000000..e83c901
--- /dev/null
+++ b/buildAndroid/spirv-tools_revision_android
@@ -0,0 +1 @@
+9149a66ca406d86967b104cac209bad309fd2c33